Planarity-measuring roller for steel strip

Abstract

A planarity-measuring roller for metallic strip has a plurality of force sensors set in respective outwardly open recesses in a roller body with respective covers overlying the sensors in the recesses, generally flush with an outer surface of the body, and spaced by a gap from the respective recesses. Metal foils overlie the recesses and are adhered to the covers and to the outer surface of the roller body all around the recesses.

1. In a planarity-measuring roller for metallic strip wherein a plurality of force sensors are set in respective outwardly open recesses in a roller body with respective covers overlying the sensors in the recesses, generally flush with an outer surface of the body, and spaced by a gap from the respective recesses, the improvement comprising:
 metal foils overlying the recesses; 
 means including a layer of adhesive adhering the foils to the covers and to the outer surface of the roller body all around the recesses, whereby the foils bridge and cover the respective gaps; and 
 a flexible sleeve covering the roller-body outer surface and foils. 
 
   
   
     2. The improvement defined in  claim 1  wherein there is one such foil overlying each such recess. 
   
   
     3. The improvement defined in  claim 1  wherein each foil overlies a plurality of the recesses. 
   
   
     4. The improvement defined in  claim 3  wherein each foil extends axially along a width of the roller body. 
   
   
     5. The improvement defined in  claim 1  wherein the foils are of spring steel. 
   
   
     6. The improvement defined in  claim 5  wherein the foils have a thickness between 10 μm and 100 μm. 
   
   
     7. The improvement defined in  claim 5  wherein the foils have a thickness of about 50 μm. 
   
   
     8. The improvement defined in  claim 1  wherein the sleeve is of polyurethane. 
   
   
     9. The improvement defined in  claim 1  wherein the sleeve is of hard chromium or tungsten carbide.